Australian actor Guy Pearce has welcomed his first child with his partner, Game of Thrones star Carice van Houten.

Guy announced Carice had given birth to a son on Twitter on Monday (29Aug16), writing, “A cute little package arrived and told us his name’s Monte Pearce. We think we’re gonna keep him. Placenta smoothie anyone?”

The 48-year-old actor tagged Carice into his post, who responded by retweeting his message alongside a selection of emojis.

The couple broke the news Carice, 39, was expecting in March (16), and made quips about her Game of Thrones character Melisandre's own deadly offspring.

In season two of the hit U.S. fantasy show the sorceress gave birth to a shadowy figure which murdered nobleman Renly Baratheon.

"Yes. It's true. Let the shadow baby jokes begin," she wrote on Twitter, while Guy added, "Nothing like the prospect of a shadowbaby to change your mind about becoming a Father !!"

Monte is both the Dutch actress's and Guy's first child, as they have no children from their previous relationships.

The Memento actor was previously married to psychologist Kate Mestitz from 1997 to 2015.